Device having inner member only moving relative to outer member but rotating

Abstract

A device includes a first movable member having at least a slot on an inner wall thereof; a second movable member provided in the first movable member; a sliding sleeve, which has at least a recess, provided between the first movable member and the second movable member; and at least a rolling member received in the recess of the sliding sleeve and contacting an inner wall of the slot of the first movable member and an outer wall of the second movable member. Whereby, the second movable can not rotate relative to the first movable member and only can move relative to the first movable member.

1 . A device, comprising:
 a first movable member having at least a slot on an inner wall thereof;   a second movable member provided in the first movable member;   a sliding sleeve, which has at least a recess, provided between the first movable member and the second movable member; and   at least a rolling member received in the recess of the sliding sleeve and contacting an inner wall of the slot of the first movable member and an outer wall of the second movable member whereby the second movable can not rotate relative to the first movable member and only can move relative to the first movable member.   
     
     
         2 . The device as defined in  claim 1 , wherein the first movable member has a tube, on which the slot is provided, on an inner wall thereof. 
     
     
         3 . The device as defined in  claim 1 , wherein the rolling member is a ball. 
     
     
         4 . A device, comprising:
 an outer tube;   an inner tube provided in the outer tube;   a guiding unit provided between the inner tube and the outer tube to allow the inner tube moving relative to the outer tube but rotating;   a first cushion unit provided in the inner tube; and   a second cushion unit provided between the inner tube and the outer tube, wherein when the inner tube moves upwards relative to the outer tube, the first cushion unit will be compressed and push the second cushion unit through the guiding unit to compress the second cushion unit, and when the inner tube moves downwards relative to the outer tube, the first cushion unit and the second cushion unit return their initial conditions.   
     
     
         5 . The device as defined in  claim 4 , wherein the outer tube has a tube, which has at least a slot, on an inner wall thereof, and the guiding unit has a sliding sleeve, which is received in the tube, having at least a recess and at least a rolling member received in the recess of the sliding sleeve contacting an outer wall of the inner tube and an inner wall of the slot of the tube, and the second cushion unit contacts a top of the sliding sleeve. 
     
     
         6 . The device as defined in  claim 5 , wherein the rolling member is a ball. 
     
     
         7 . The device as defined in  claim 5 , wherein the tube has a stop portion contacting a bottom of the sliding sleeve to prevent the sliding sleeve and the rolling member from escaping the tube. 
     
     
         8 . The device as defined in  claim 5 , wherein the inner tube has an elastic member fitted to the inner tube and contacting the bottom of the sliding sleeve. 
     
     
         9 . The device as defined in  claim 5 , wherein the outer tube has a plug therein, and the second cushion unit is provided between the plug and the sliding sleeve. 
     
     
         10 . The device as defined in  claim 9 , further comprising an inner shaft and a worm shaft, wherein the outer tube has a nut, and the inner shaft is received in the inner tube with opposite ends contacting the first cushion unit and the worm shaft, and the worm shaft passes through the plug to be screwed into the nut. 
     
     
         11 . The device as defined in  claim 4 , wherein the outer tube has an O ring and a bearing, both of which are fixed in the outer tube at a bottom end thereof, and the inner tube is inserted into the outer tube to contact the O ring and the bearing. 
     
     
         12 . A device, comprising:
 an outer tube having a non-circular cross-section;   an inner shaft provided in the outer tube;   a sliding sleeve provided between the outer tube and the inner shaft, wherein the sliding sleeve has a cross-section complementary to the outer tube; and   at least a rolling member provided on the sliding sleeve and contacting an inner wall of the outer tube and an outer wall of the inner shaft to prevent the inner shaft from rotating relative to the outer shaft but allow the inner shaft moving relative to the outer shaft.   
     
     
         13 . The device as defined in  claim 12 , wherein the outer tube has a tube on the inner wall thereon, and the tube has a non-circular cross-section. 
     
     
         14 . The device as defined in  claim 13 , wherein both of the tube and the sliding sleeve have polyhedral cross-sections. 
     
     
         15 . The device as defined in  claim 12 , wherein the rolling member is a ball. 
     
     
         16 . The device as defined in  claim 12 , wherein the rolling member is a post.